CN111041349A - High-chromium alloy corrosion-resistant continuous pipe and preparation method thereof - Google Patents
High-chromium alloy corrosion-resistant continuous pipe and preparation method thereof Download PDFInfo
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- CN111041349A CN111041349A CN201911169818.5A CN201911169818A CN111041349A CN 111041349 A CN111041349 A CN 111041349A CN 201911169818 A CN201911169818 A CN 201911169818A CN 111041349 A CN111041349 A CN 111041349A
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- chromium alloy
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
Abstract
The invention discloses a high-chromium alloy corrosion-resistant continuous pipe and a preparation method thereof, wherein the preparation method comprises the following steps: preparing a coiled plate special for the continuous tube by processes of decarburization, ladle refining, continuous casting technology, water cooling, acid pickling and the like; preparing a high-chromium alloy corrosion-resistant continuous tube by plate rolling longitudinal shearing, steel strip butt joint, UOE row roller forming and laser welding technologies; and (3) carrying out whole tube heat treatment on the continuous tube by adopting a medium-frequency induction heating mode to obtain a continuous tube product with excellent comprehensive performance. The continuous pipe product has the yield strength of 483-758MPa, the tensile strength of 552-793MPa, the elongation of more than or equal to 30 percent, the hardness of less than or equal to 28HRC, high corrosion resistance,High strength, high ductility and toughness, and is suitable for high H content2S、CO2The continuous pipe continuous.
Description
The technical field is as follows:
the invention relates to the technical field of continuous pipe preparation, in particular to a high-chromium alloy corrosion-resistant continuous pipe and a preparation method thereof.
Background art:
the coiled tubing is a novel oil-gas tubing which has high strength, high plasticity and certain corrosion resistance, and the length of a single tubing can reach thousands of meters. Because the coiled tubing technology has a series of technical advantages and operational advantages of high efficiency, low cost, wide operation range, small occupied area and the like, the coiled tubing plays more and more important roles in oil and gas field exploration, development, operation and yield increase and has wide application prospect.
With the continuous development of the continuous tube technology, the service environment of the continuous tube technology is more and more rigorous, and the requirement on a continuous tube product with certain corrosion resistance is urgent. At present, the materials of coiled tubing at home and abroad are mainly low alloy carbon steel, and when the coiled tubing produced by the low alloy carbon steel is in service in an oil and gas field with high corrosive media, the high-temperature and high-pressure multiphase flow environment under an oil and gas well contains CO2、H2Corrosive gases such as S and high concentration of Cl-、HCO3-The produced water belongs to NaHCO when corrosive anions are equal3And CaCl2Water type and high mineralization degree. The corrosion medium acts on the outer surface of the low alloy carbon steel continuous pipe body and Fe or Fe in the pipe body in an ion form for a long time under certain temperature and pressure conditions2+The low alloy carbon steel continuous pipe can generate weightless corrosion and local corrosion with high corrosion rate in service, and can be subjected to tensile stress of self weight and periodic plastic strain in the operation process, and can be reacted with H in the well to corrode the pipe body2S、CO2The synergistic effect of corrosive media causes material performance degradation and plasticity reduction, easily causes pipe body cracking or pipe material to suddenly break when the stress is far lower than the yield strength of the pipe material, the light causes the whole continuous pipe or the whole well to be scrapped, and the heavy causes the hydrogen sulfide to overflow along with oil gas, thereby causing huge damage to wellhead equipment and surrounding ecological environment.
Meanwhile, the welding mode in the existing manufacturing method of the low-alloy carbon steel continuous tube mainly adopts HFW high-frequency welding, and the welding mode has the advantages of no need of adding filler metal, high welding speed, high production efficiency and the like, but in the welding process, metal oxides are often clamped on a fusion surface to form inclusions along with extrusion of molten metal; the heating temperature is high during welding, a brittle tissue is easily formed due to large temperature gradient, the comprehensive mechanical property of a welding seam is greatly reduced, burrs can be formed on the inner wall of the continuous pipe manufactured by HFW high-frequency welding, the inner wall burrs not only influence the inner diameter of oil-gas circulation in the pipe, but also micro-area grooves are easily formed on the periphery of the burrs, the grooves are corroded, and the service life of the continuous pipe is greatly reduced.
The invention content is as follows:
the invention aims to provide a high-chromium alloy corrosion-resistant continuous pipe and a preparation method thereof, wherein the continuous pipe has high corrosion resistance, high strength and high ductility and toughness and can contain high H2S、CO2And the like in acid oil and gas fields with corrosive media.
In order to solve the technical problems, the invention adopts the technical scheme that:
a high-chromium alloy corrosion-resistant continuous pipe comprises the following plate chemical components in percentage by mass: cr: 13 to 18 percent; ni: 1.0-5.0%; c: less than or equal to 0.09 percent; si: less than or equal to 1 percent; s: less than or equal to 0.03 percent; p: less than or equal to 0.04 percent; n: 0.15-0.30%; mn: 6.0 to 9.5 percent, and the balance of Fe and inevitable impurities.
The manufacturing method of the high-chromium alloy corrosion-resistant continuous pipe comprises the following steps:
(1) preparing a rolled plate: the method comprises the steps of taking molten iron as a main raw material, adding alloy, heating in a converter to 1450-.
(2) Plate rolling longitudinal shearing and steel belt lengthening: the prepared high-chromium alloy coiled plate is cut into steel strips with the width of 50-300mm by a longitudinal shearing unit according to the specification requirement of a continuous tube, the ends of the front steel strip and the rear steel strip are processed into 45 degrees, grooves are reasonably processed, the grooves are I-shaped, V-shaped or U-shaped, the steel strips are welded by adopting an argon protection laser welding method, and after the welding line is cooled, the surface of the welding line is polished and cleaned. Then, the welding seam and the heat affected zone are reheated to the temperature of 1020-1150 ℃ in the protective atmosphere, and the welding seam and the heat affected zone are cooled to the normal temperature at the cooling speed of more than 7 ℃/s after heat preservation for 30-300 s.
(3) Forming and welding: planning the side surface of the steel strip into an I-shaped groove by adopting an edge milling method according to the requirements of the outer diameter and the wall thickness of the final high-chromium alloy corrosion-resistant continuous pipe, accurately controlling the width of the steel strip and the verticality of the edge of the steel strip, and controlling the forming of the steel strip by adopting a UOE gang roller forming method; by utilizing a laser welding technology, parameters such as defocusing amount, laser power, welding speed and the like are accurately controlled, and the formed steel belt is longitudinally welded to ensure the welding quality; controlling the forming groove gap to be less than or equal to 0.1mm, defocusing amount to be-2-8 mm, laser power to be 2-15 kw, and welding speed to be 1.5-8 m/min.
(4) Whole tube heat treatment: after welding, the high-chromium alloy corrosion-resistant continuous pipe body is heated by adopting a medium-frequency induction heating mode to 1020 ℃ and 1150 ℃, heat preservation is carried out for 0.5-10min, and then H2And rapidly cooling the tube body to the normal temperature at a cooling speed of more than or equal to 7 ℃/s under the protection of the atmosphere.
(5) And (3) continuous curling: and (4) curling the high-chromium alloy corrosion-resistant continuous pipe subjected to heat treatment by using a coiler to obtain the high-chromium alloy corrosion-resistant continuous pipe with the required length.
The outer diameter range of the high-chromium alloy corrosion-resistant continuous pipe is phi 25.4-phi 88.9mm, the wall thickness range is 1.9-6.4mm, and the length range is 500-10000 m. Can be wound onto a roll of appropriate core diameter for shipping and use.
The invention has the beneficial effects that:
1. the invention adopts Cr-Ni-Mn-N-Fe system to design chemical components, and the high-chromium alloy contains high Cr and Ni contents, so that the pipe body has strong corrosion resistance, and the high H content of the continuous pipe is greatly improved2S、CO2And the like, and the operation life in the acid oil and gas field of corrosive media. Meanwhile, the high-chromium alloy also contains higher elements such as Mn and N, so that the body of the coiled tubing has higher strength, and the whole tubing well descending depth is ensured.
2. The invention adopts laser welding after the coiled sheet of the continuous tube is formed, has high welding efficiency and attractive weld forming and can obtain larger depth-to-width ratio. Meanwhile, the laser welding head has high cooling speed and small heat affected zone, and has positive effects of avoiding the formation of inclusions of oxides in the welding joint and improving the corrosion resistance of the welding joint under the protection of gas. The inner wall of the tubular column after laser welding has no obvious burrs, the inner diameter of oil-gas circulation in the continuous tube is effectively improved, and the phenomena of groove corrosion and the like are avoided.
3. The high-chromium alloy corrosion-resistant continuous pipe manufactured by the method has the yield strength of 483-758MPa, the tensile strength of 552-793MPa, the elongation of more than or equal to 30 percent and the hardness of less than or equal to 28HRC, has high corrosion resistance, high strength and high ductility and toughness, and is suitable for containing high H2S、CO2And the like in acid oil and gas fields in corrosive environments.
The specific implementation mode is as follows:
1. preparation of high-chromium alloy corrosion-resistant coiled tube plate
The invention adopts a Cr-Ni-Mn-N-Fe system, takes molten iron as a main raw material, adds alloy, heats the molten iron in a converter to 1450 ℃ and 1550 ℃ for primary melting, decarbonization and ladle refining, and pours the molten iron into continuous casting billets at 1500 ℃ and 1550 ℃ after the component mass percentage of the molten iron meets the following requirements.
| C | Si | Mn | P | S | Cr | Ni | N | Fe |
| ≤0.09％ | ≤1％ | 6.0-9.5％ | ≤0.04％ | ≤0.03％ | 13-18％ | 1.0-5.0％ | 0.15-0.30％ | The rest(s) |
Heating the casting blank to 1150-plus 1260 ℃, casting the casting blank into a plate blank with the thickness of 20-60mm by adopting a continuous casting technology and applying electromagnetic stirring control, finally rolling a hot rolled plate with the thickness of 2.8mm and the width of 1180mm at the temperature of 1000-plus 1050 ℃, and curling after water cooling and acid cleaning to finally prepare a coiled plate with the length of more than 500 meters.
2. Preparation of high-chromium alloy corrosion-resistant continuous pipe
(1) Plate rolling longitudinal shear and steel belt lengthening
Shearing the prepared high-chromium alloy coiled plate into a 94.4mm steel strip by a longitudinal shearing unit; in order to meet the length requirement of the continuous pipe, the ends of the front and rear steel belts are processed into 45-degree bevel edges, I-shaped grooves are formed in the 45-degree bevel edges, the front and rear steel belt bevel edges are subjected to butt welding by an argon arc laser welding method, and after the welding line is cooled, the surface of the welding line is polished and cleaned. And then the welding seam and the heat affected zone are reheated to 1080 ℃ in protective atmosphere, and the welding seam and the heat affected zone are cooled to normal temperature at a cooling speed of more than 7 ℃/s after heat preservation for 120 s.
(2) Forming and welding of coiled tubing
Planning the side surface of the steel belt into an I-shaped groove by adopting an edge milling method, accurately controlling the width of the steel belt and the verticality of the plate edge, and forming the steel belt by adopting a UOE roller arrangement forming method; the formed steel band is longitudinally welded by adopting a laser welding technology, and parameters such as defocusing amount, laser power, welding speed and the like are accurately designed: defocusing amount is +4mm, laser power is 3.5kw, welding speed is 2m/min, and the welding seam is ensured to have no defects such as air holes, microcracks and the like after welding. Finally, the straight slit high chromium alloy corrosion-resistant continuous pipe with the pipe diameter of phi 38.1mm and the wall thickness of 2.8mm is welded.
(3) Whole tube heat treatment
Heating the high-chromium alloy corrosion-resistant continuous pipe column at 1050 ℃ by adopting a medium-frequency induction heating mode, preserving heat for 1min, and then carrying out H2And rapidly cooling the pipe column to the normal temperature at a cooling speed of more than or equal to 7 ℃/s under the protection of the atmosphere.
(4) Continuous crimping
And winding the heat-treated high-chromium alloy corrosion-resistant continuous pipe onto a winding drum with a proper core diameter through a winding machine, and continuously producing the high-chromium alloy corrosion-resistant continuous pipe with the length of 3500m for transportation and use.
3. Main performance of high-chromium alloy corrosion-resistant continuous pipe
Yield strength 502MPa, tensile strength 762MPa, hardness 23HRC and elongation 40%.
While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A high-chromium alloy corrosion-resistant continuous pipe is characterized in that: the plate of the continuous tube comprises the following chemical components in percentage by mass: cr: 13 to 18 percent; ni: 1.0-5.0%; c: less than or equal to 0.09 percent; si: less than or equal to 1 percent; s: less than or equal to 0.03 percent; p: less than or equal to 0.04 percent; n: 0.15-0.30%; mn: 6.0 to 9.5 percent, and the balance of Fe and inevitable impurities.
2. The high chromium alloy corrosion resistant continuous pipe of claim 1, wherein: the outer diameter range of the continuous pipe is phi 25.4-phi 88.9mm, the wall thickness range is 1.9-6.4mm, and the length range is 500-10000 m.
3. The high chromium alloy corrosion resistant continuous pipe of claim 1, wherein: the yield strength of the continuous pipe is 483-758MPa, the tensile strength is 552-793MPa, the elongation is more than or equal to 30 percent, and the hardness is less than or equal to 28 HRC.
4. The method for preparing the high-chromium alloy corrosion-resistant continuous pipe according to claim 1, which is characterized in that: the method comprises the following steps:
(1) preparing a rolled plate: the method comprises the steps of taking molten iron as a main raw material, adding alloy, heating in a converter to 1450-.
(2) Plate rolling longitudinal shearing and steel belt lengthening: the prepared high-chromium alloy coiled plate is cut into steel strips with the width of 50-300mm by a longitudinal shearing unit according to the specification requirement of a continuous tube, the ends of the front steel strip and the rear steel strip are processed into 45 degrees, grooves are reasonably processed, the grooves are I-shaped, V-shaped or U-shaped, the steel strips are welded by adopting an argon protection laser welding method, and after the welding line is cooled, the surface of the welding line is polished and cleaned. Then, the welding seam and the heat affected zone are reheated to the temperature of 1020-1150 ℃ in the protective atmosphere, and the welding seam and the heat affected zone are cooled to the normal temperature at the cooling speed of more than 7 ℃/s after heat preservation for 30-300 s.
(3) Forming and welding: planning the side surface of the steel strip into an I-shaped groove by adopting an edge milling method according to the requirements of the outer diameter and the wall thickness of the final high-chromium alloy corrosion-resistant continuous pipe, accurately controlling the width of the steel strip and the verticality of the edge of the steel strip, and controlling the forming of the steel strip by adopting a UOE gang roller forming method; by utilizing a laser welding technology, parameters such as defocusing amount, laser power, welding speed and the like are accurately controlled, and the formed steel belt is longitudinally welded to ensure the welding quality; controlling the forming groove gap to be less than or equal to 0.1mm, defocusing amount to be-2-8 mm, laser power to be 2-15 kw, and welding speed to be 1.5-8 m/min.
(4) Whole tube heat treatment: after welding, medium frequency induction is adoptedHeating the high-chromium alloy corrosion-resistant continuous pipe body 1020-1150 ℃ in a heating mode, preserving the heat for 0.5-10min, and then carrying out heat preservation on the pipe body in H2And rapidly cooling the tube body to the normal temperature at a cooling speed of more than or equal to 7 ℃/s under the protection of the atmosphere.
(5) And (3) continuous curling: and (4) curling the high-chromium alloy corrosion-resistant continuous pipe subjected to heat treatment by using a coiler to obtain the high-chromium alloy corrosion-resistant continuous pipe with the required length.
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Cited By (4)
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|---|---|---|---|---|
| CN111441002A (en) * | 2020-05-18 | 2020-07-24 | 中国石油天然气集团有限公司 | Duplex stainless steel continuous pipe and manufacturing method thereof |
| CN111570559A (en) * | 2020-05-18 | 2020-08-25 | 中国石油天然气集团有限公司 | Low-carbon high-strength austenitic stainless steel continuous tube and preparation method thereof |
| CN113088832A (en) * | 2021-03-26 | 2021-07-09 | 中国石油天然气集团有限公司 | Iron-nickel-based corrosion-resistant alloy continuous tube and manufacturing method thereof |
| WO2023216433A1 (en) * | 2022-05-09 | 2023-11-16 | 河南董氏管道有限公司 | Ultra-thin wall large-diameter stainless steel welded pipe and manufacturing method therefor |
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Application publication date: 20200421 |